401798981 has 2 divisors, whose sum is σ = 401798982. Its totient is φ = 401798980.

The previous prime is 401798951. The next prime is 401798987. The reversal of 401798981 is 189897104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244421956 + 157377025 = 15634^2 + 12545^2 .

It is a cyclic number.

It is not a de Polignac number, because 401798981 - 2¹⁴ = 401782597 is a prime.

It is a super-2 number, since 2×401798981² = 322884842265276722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401798987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200899490 + 200899491.

It is an arithmetic number, because the mean of its divisors is an integer number (200899491).

Almost surely, 2^401798981 is an apocalyptic number.

It is an amenable number.

401798981 is a deficient number, since it is larger than the sum of its proper divisors (1).

401798981 is an equidigital number, since it uses as much as digits as its factorization.

401798981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 401798981 is about 20044.9240706968. The cubic root of 401798981 is about 737.9092316938.

The spelling of 401798981 in words is "four hundred one million, seven hundred ninety-eight thousand, nine hundred eighty-one".